Improvement in steam-boilers



P. T. BROWNELL.

vSteam-lnilers.

Patented July 7,1874.

' mviuomf l n ,III ulllgllllllll ATTORNEYS.

WITNESSES THE SRAPHIG CD. PHDTO-'LITILSSKH PR( PLACEINX.

UNITED STATES PATENT OFFICE.

PHILIP T. BROWNELL, OF ELMIRA, NEW YORK.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Iatent No. 152,791, dated July 7, 1874; application tiled January 5, 1874.

' spondin g parts.

The object ot' my invention is to construct a steam-boiler with increased heating-surface for less powerful engines, in which steam may be rapidly generated, directly transferred to the cylinders, and the action of the lire on the boiler instantly interrupted in case of danger, or for the purpose of stopping the engine.

The invention will first be fully described, and then pointed out in the claims.

In the drawing, A represents the horizontal steam-boiler, made ot' cast-iron or plates, the lower half ot' which is made thicker than the upper halt', for the purpose of strengthening the same suiciently to be perforated with a suitable number of holes, for connecting therewith the downward-extending vertical tubes B, which are closed at their lower ends. The boiler A is supported at both ends, and surrounded along its longer sides by a casing, C, which forms a chamber around the boiler for the escape ot' the smoke to the chimney, as shown in the drawing. In the lower part of casing O, below the boiler-tubes B, slides, on suitable guide-flanges, a, the movable lirebox and grate D, `which is placed, for the purpose of withdrawing it rapidly from below the boiler, on legs with casters, b. As the tubes B extend down nearly to the top ofthe lire-box D, the lire acts on the bottom and sides of the same, passes then around the boiler, and generates thereby steam very rapidly. The smoke will pass out to the chimney, above the boiler, 'with nearly all its heat being utilized for developing steam. The fire-box D, when drawn out, allows thereby the instant interruption of the action of the heat on the boiler, and is then covered by a lid, D', which is hinged to the outer side ot' casing C and carried down over the firebox. By a weight and chain attached to lid D', the same may be thrown up against casing C, and retained in this position during the time the nre-box is pushed in for use. The front part ot' the tire-box is provided with a flange, b, which projects forward under right angles to the front, and serves to close the smoke-channel C', arranged along the inside of casing C by an interior plate or Wall, E, which extends between boiler and casing from the tire-box to the chimney, as shown in Fig. 1.

When the ire-box is drawn out, the rear wall of the same comes in contact with the lower edge of the plate E, so that the smoke of the fire may pass out directly through the smokechannel Cf to the chimney without iniiuencing tubes B or 'boiler A. The circular front head F ofthe boiler A is bolted in suitable manner to the same, and provided at its inner -i'ace with a steam drum and cylinders for a three-cylinder engine, into which the steam is directly introduced, as developed in the boiler, requiring no connecting-pipes, and economizin g considerable space thereby. The whole boiler and engine may be built in very compact shape, easily started, and its opera tion quickly interrupted, being mainly' adapted for engines ot' smaller size.

Having thus described my invention, I claim. as new, and desire to secure by Letters Patent- 1. A boiler having the line C', leading to its smoke-discharge pipe, connected with a sliding lirebox, D, to take off the products of combustion when said fire-box is withdrawn.

2. A sliding fire-box provided with the lip b, arranged to close the line C when the tirebox has been pushed under the boiler.

3. A sliding lire-box, D, combined, as de scribed, with a plate, D, hinged to the boilercase, covering the top of fire-box when said box is drawn out, and swinging up out otl the Witnesses LovELL KELLOGG, J oI-INv BARTHOLOMEW. 

